303 lines
6.6 KiB
C
303 lines
6.6 KiB
C
/*
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* Copyright (c) 2001 Alexander Kabaev
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <stdlib.h>
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#include "rtld_lock.h"
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#include "thr_private.h"
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static int _thr_rtld_clr_flag(int);
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static void *_thr_rtld_lock_create(void);
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static void _thr_rtld_lock_destroy(void *);
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static void _thr_rtld_lock_release(void *);
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static void _thr_rtld_rlock_acquire(void *);
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static int _thr_rtld_set_flag(int);
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static void _thr_rtld_wlock_acquire(void *);
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#ifdef NOTYET
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static void *
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_thr_rtld_lock_create(void)
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{
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pthread_rwlock_t prwlock;
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if (_pthread_rwlock_init(&prwlock, NULL))
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return (NULL);
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return (prwlock);
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}
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static void
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_thr_rtld_lock_destroy(void *lock)
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{
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pthread_rwlock_t prwlock;
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prwlock = (pthread_rwlock_t)lock;
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if (prwlock != NULL)
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_pthread_rwlock_destroy(&prwlock);
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}
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static void
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_thr_rtld_rlock_acquire(void *lock)
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{
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pthread_rwlock_t prwlock;
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prwlock = (pthread_rwlock_t)lock;
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_thr_rwlock_rdlock(&prwlock);
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}
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static void
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_thr_rtld_wlock_acquire(void *lock)
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{
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pthread_rwlock_t prwlock;
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prwlock = (pthread_rwlock_t)lock;
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_thr_rwlock_wrlock(&prwlock);
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}
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static void
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_thr_rtld_lock_release(void *lock)
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{
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pthread_rwlock_t prwlock;
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prwlock = (pthread_rwlock_t)lock;
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_thr_rwlock_unlock(&prwlock);
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}
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static int
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_thr_rtld_set_flag(int mask)
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{
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struct pthread *curthread;
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int bits;
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curthread = _get_curthread();
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if (curthread != NULL) {
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bits = curthread->rtld_bits;
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curthread->rtld_bits |= mask;
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} else {
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bits = 0;
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PANIC("No current thread in rtld call");
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}
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return (bits);
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}
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static int
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_thr_rtld_clr_flag(int mask)
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{
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struct pthread *curthread;
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int bits;
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curthread = _get_curthread();
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if (curthread != NULL) {
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bits = curthread->rtld_bits;
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curthread->rtld_bits &= ~mask;
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} else {
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bits = 0;
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PANIC("No current thread in rtld call");
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}
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return (bits);
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}
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void
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_thr_rtld_init(void)
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{
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struct RtldLockInfo li;
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li.lock_create = _thr_rtld_lock_create;
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li.lock_destroy = _thr_rtld_lock_destroy;
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li.rlock_acquire = _thr_rtld_rlock_acquire;
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li.wlock_acquire = _thr_rtld_wlock_acquire;
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li.lock_release = _thr_rtld_lock_release;
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li.thread_set_flag = _thr_rtld_set_flag;
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li.thread_clr_flag = _thr_rtld_clr_flag;
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li.at_fork = NULL;
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_rtld_thread_init(&li);
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}
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void
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_thr_rtld_fini(void)
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{
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_rtld_thread_init(NULL);
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}
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#endif
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struct rtld_kse_lock {
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struct lock lck;
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struct kse *owner;
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kse_critical_t crit;
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int count;
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int write;
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};
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static void *
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_thr_rtld_lock_create(void)
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{
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struct rtld_kse_lock *l;
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if ((l = malloc(sizeof(struct rtld_kse_lock))) != NULL) {
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_lock_init(&l->lck, LCK_ADAPTIVE, _kse_lock_wait,
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_kse_lock_wakeup, calloc);
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l->owner = NULL;
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l->count = 0;
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l->write = 0;
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}
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return (l);
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}
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static void
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_thr_rtld_lock_destroy(void *lock __unused)
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{
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/* XXX We really can not free memory after a fork() */
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#if 0
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struct rtld_kse_lock *l;
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l = (struct rtld_kse_lock *)lock;
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_lock_destroy(&l->lck);
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free(l);
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#endif
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return;
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}
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static void
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_thr_rtld_rlock_acquire(void *lock)
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{
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struct rtld_kse_lock *l;
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kse_critical_t crit;
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struct kse *curkse;
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l = (struct rtld_kse_lock *)lock;
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crit = _kse_critical_enter();
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curkse = _get_curkse();
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if (l->owner == curkse) {
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l->count++;
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_kse_critical_leave(crit); /* probably not necessary */
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} else {
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KSE_LOCK_ACQUIRE(curkse, &l->lck);
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l->crit = crit;
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l->owner = curkse;
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l->count = 1;
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l->write = 0;
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}
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}
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static void
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_thr_rtld_wlock_acquire(void *lock)
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{
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struct rtld_kse_lock *l;
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kse_critical_t crit;
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struct kse *curkse;
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l = (struct rtld_kse_lock *)lock;
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crit = _kse_critical_enter();
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curkse = _get_curkse();
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if (l->owner == curkse) {
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_kse_critical_leave(crit);
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PANIC("Recursive write lock attempt on rtld lock");
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} else {
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KSE_LOCK_ACQUIRE(curkse, &l->lck);
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l->crit = crit;
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l->owner = curkse;
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l->count = 1;
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l->write = 1;
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}
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}
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static void
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_thr_rtld_lock_release(void *lock)
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{
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struct rtld_kse_lock *l;
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kse_critical_t crit;
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struct kse *curkse;
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l = (struct rtld_kse_lock *)lock;
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crit = _kse_critical_enter();
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curkse = _get_curkse();
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if (l->owner != curkse) {
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/*
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* We might want to forcibly unlock the rtld lock
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* and/or disable threaded mode so there is better
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* chance that the panic will work. Otherwise,
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* we could end up trying to take the rtld lock
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* again.
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*/
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_kse_critical_leave(crit);
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PANIC("Attempt to unlock rtld lock when not owner.");
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} else {
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l->count--;
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if (l->count == 0) {
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/*
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* If there ever is a count associated with
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* _kse_critical_leave(), we'll need to add
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* another call to it here with the crit
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* value from above.
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*/
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crit = l->crit;
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l->owner = NULL;
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l->write = 0;
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KSE_LOCK_RELEASE(curkse, &l->lck);
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}
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_kse_critical_leave(crit);
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}
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}
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static int
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_thr_rtld_set_flag(int mask __unused)
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{
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return (0);
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}
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static int
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_thr_rtld_clr_flag(int mask __unused)
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{
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return (0);
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}
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void
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_thr_rtld_init(void)
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{
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struct RtldLockInfo li;
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li.lock_create = _thr_rtld_lock_create;
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li.lock_destroy = _thr_rtld_lock_destroy;
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li.rlock_acquire = _thr_rtld_rlock_acquire;
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li.wlock_acquire = _thr_rtld_wlock_acquire;
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li.lock_release = _thr_rtld_lock_release;
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li.thread_set_flag = _thr_rtld_set_flag;
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li.thread_clr_flag = _thr_rtld_clr_flag;
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li.at_fork = NULL;
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_rtld_thread_init(&li);
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}
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void
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_thr_rtld_fini(void)
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{
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_rtld_thread_init(NULL);
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}
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